Journal of Applied Sciences ›› 2021, Vol. 39 ›› Issue (5): 747-776.doi: 10.3969/j.issn.0255-8297.2021.05.004

• Optical Fiber Sensors Technology • Previous Articles     Next Articles

Review of Distributed Optical Fiber Sensing Technology and Application Based on Large-Scale Grating Array Fiber

GUI Xin1, LI Zhengying1,2, WANG Honghai1, WANG Lixin1, GUO Huiyong1   

  1. 1. National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, Hubei, China;
    2. Hubei Key Laboratory of Broadband Wireless Communication and Sensor Networks, Wuhan University of Technology, Wuhan 430070, Hubei, China
  • Received:2021-06-18 Published:2021-10-11

Abstract: Fiber Bragg grating (FBG) sensing technology is widely used in the detection of temperature, strain and vibration in harsh environment, owing to its high sensitivity, anti-electromagnetic interference, small size and easy reuse. The realization of large-scale grating array fiber preparation method based on on-line fiber drawing tower breaks through the limitations of traditional distributed sensing technology of fiber grating due to mechanical strength and complex preparation process, which greatly expands its application in the field of distributed sensing. In this paper, the fabrication, distributed demodulation method and application progress of large-scale grating array fiber are systematically introduced. Firstly, the on-line fabrication technology and process of large-scale grating array fiber are introduced. Secondly, the distributed sensing demodulation technology including quasi-static wavelength demodulation technology, high-speed wavelength demodulation technology and enhanced dynamic phase demodulation technology are introduced, where some key technologies such as demodulation speed, spatial resolution, multiplexing capacity and sensing performance are especially focused on. At the same time, the applications based on large-scale grating array fiber are also introduced, including quasi-static applications of temperature and strain distribution and phase dynamic applications of vibration distribution, which can be widely applied in safety monitoring and fault diagnosis in large-scale construction, machinery, aerospace, petrochemical, and other engineering fields.

Key words: fiber Bragg grating (FBG), fiber distributed sensing, optical time domain reflectometer (OTDR), optical frequency domain reflectometer (OFDR)

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